微通道型氨裂解制氢反应器的模拟分析  

Simulation analysis of microchannel type ammonia cracking reactor for hydrogen production

作　　者：卢星辰 陈蕊 詹志刚[1,2,3] 唐浩林 LU Xingchen;CHEN Rui;ZHAN Zhigang;TANG Haolin(School of Automotive Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Provincial Key Laboratory of Fuel Cell,Wuhan,Hubei 430070,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070 [3]燃料电池湖北省重点实验室,湖北武汉430070

出　　处：《电池》2024年第5期622-627,共6页Battery Bimonthly

基　　金：国家自然科学基金项目(22179103,21676207)。

摘　　要：为优化微通道型氨裂解制氢反应器的性能,建立三维稳态多物理场耦合数值模型,模拟研究反应器内速度、密度、温度、浓度和反应速率的分布情况,以及流道长度和操作条件对NH 3转化率的影响。随着反应的进行,由入口沿着流道长度方向流体流速增加,密度则下降;温度梯度和浓度梯度在入口处附近最显著,氨裂解反应主要集中在微通道的前半段,在基准工况(温度773 K、压力101.325 kPa和流量400 mL/min)下,距离入口50%长度段内,至少有80%的NH_(3)发生了裂解;增加流道长度、升高温度、减少流量和降低压力都可提高NH 3转化率,其中温度的影响最大。当温度T≥823 K时,即使流量达到800 mL/min、压力在0.7 MPa下,NH_(3)的转化率也能达到83.79%。In order to optimize the performance of the microchannel type ammonia cracking reactor for hydrogen production,a three-dimensional steady-state multi-physical field coupling numerical model is established.The distribution of velocity,density,temperature,concentration and reaction rate in the reactor,as well as the effects of flow channel length and operating conditions on the NH 3 conversion rate are simulated and studied.The velocity of fluid increases and the density decreases from the inlet to the outlet along the flow channel as the reaction proceeds.The temperature and concentration gradients are the most pronounced near the inlet,the ammonia cleavage reaction is mainly concentrated in the first half of the microchannel.Under the baseline conditions(temperature 773 K,pressure 101.325 kPa,and flow rate 400 mL/min),at least 80%of NH_(3) is cracked within 50%of the length from the inlet.Increasing the flow channel length and the temperature,decreasing the flow rate and the pressure can increase the NH_(3) conversion rate,the effect of temperature is the greatest.When the temperature T≥823 K,the NH 3 conversion rate can reach 83.79%,even if the flow rate reaches 800 mL/min and the pressure is 0.7 MPa.

关 键 词：氨 制氢 微通道 数值模拟 传热 传质 

分 类 号：TM911.42[电气工程—电力电子与电力传动]